CHEMICAL REACTION ENGINEERING QUIZ

In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ (i) with increase in temperature and (ii) with increase in the mole ratio of SO₂ to air.

(i) decreases (ii) decreases

(i) increases (ii) decreases

(i) decreases (ii) increases

(i) increases (ii) increases

TRUE ANSWER : ?
YOUR ANSWER : ?

The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m³ is fed to the reactor at the rate of 0.01 m³ /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k)is (Data: Heat of reaction at 298 K = - 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature))

500

1000

400

600

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of calcination of limestone, CaCO₃ CaO + CO₂, the addition of more of CaO will result in __________ in the concentration of CO₂.

Unpredictable from the data

No change

Decrease

Increase

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of staged packed bed reactors carrying out exothermic reaction, use

All of these

High recycle for pure gas

Plug flow for dilute liquid requiring no large preheating of feed

Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

The rate constant of a chemical reaction decreases by decreasing the

Temperature

Concentration of reactants

Duration of reaction

Pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

For a zero order chemical reaction, the

Plot of products concentration with time is a straight line through the origin

Half life period is directly proportion to the initial concentration of the reac-tants

Products concentration increases linerarly with time

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A batch reactor suffers from following disadvantage.

High shutdown time requirement for emptying, cleaning and refilling

All of these

High labour and handling cost

Poor product quality control

TRUE ANSWER : ?
YOUR ANSWER : ?

In a/an __________ vessel, the fluid enters and leaves following plug flow.

Open

Closed

Close-opened

Open-closed

TRUE ANSWER : ?
YOUR ANSWER : ?

The temperature dependence of reaction rate constant (K) by Arhenius law is given by

K α T . e-E/RT

K α √T . e-E/RT

K α eE/RT

K α e-E/RT

TRUE ANSWER : ?
YOUR ANSWER : ?

An isothermal aqueous phase reversible reaction, P ⇋ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m³ .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the

2.67

1.33

1.60

0.80

TRUE ANSWER : ?
YOUR ANSWER : ?